In a letter to the FTC, New York Senator Charles Schumer expressed concerns that privacy rights may be infringed as contact names, telephone numbers and email addresses are acquired from devices without user permission.

"These uses go well beyond what a reasonable user understands himself to be consenting to when he allows an app to access data on the phone for purposes of the app's functionality," Reuters quoted Schumer as saying in the letter.

"[Smartphone] makers should be required to put in place safety measures to ensure third-party applications are not able to violate a user's personal privacy by stealing photographs or data that the user did not consciously decide to make public."

Schumer noted that it was unclear whether the use of personal information in this way violates the terms of service of the Apple and Android platforms.

"It is not clear whether or how those terms of service are being enforced and monitored," he added.

Google and Apple have not responded to comment from ClickZ sister site V3 on the development.

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